galdwell



2 Sheets-Sheet 1.

.(No Model.)

B. P. CALDWELL.

PUMP.

Patented July 1 WITNESSES:

(No Model.) 2 Sheets$heet 2.

B. P. CALDWELL.

PUMP. No. 301,336. Patent II nnnnnnn -i III! WITNESSES: INVBN TOR.

ATT ORN EYS.

N. PETERS. Phuwuma m mr. wmhinmn, n. C.

UNTTE hTaTns PATENT Trice.

BENJAMIN'F. eALnwnLL, or ROOKVILLE, MISSOURI.

PUMP.

SPECIFICATION forming part of Letters Patent No. 301,336, dated July 1,1884:. Application filed November 15, 1983. (No model.)

T at whom it may concern:

Be it known that I, BENJAMIN F. CALDWELL, of Rockville, in the county ofBates and State erence being had to the accompanying draw ings, whichform a part of this specification, and in which Figure 1 is a verticalsectional v1ew of my I improved pump, showing it in position in thewell. Fig. 2 is a similar viewof the pumpcylinder on an enlarged scale.Fig. 3 is a perspective view of the plungeror piston seen from the top,and Fig. 4 is a similar view of the ends of the cylinder with suitablethe same seen from the bottom.

Similar letters of reference indicate corresponding parts in all thefigures.

My invention has relation to combined lift and force pumps having hollowpiston-rods; and it consists in the improved construction andcombination of parts of the same, as hereinafter more fully describedand claimed.

In the accompanying drawings,the letter A indicates the pump-cylinder,which is pro vided with anupper and lower head, B and G, the upper one,B, of which forms a central stuffing-box, D, while the lower one, 0,forms a central downwardly-pointing funnel-shaped valve;seat, E, uponwhich a ball-valve, F, plays, which is prevented from being drawn offits seat by a transverse rod, G, spanning the top of the valve-seat. Theheads rest upon packing interposed, and are held in place, bearingagainst the ends of the cylinder, by means of rods H passing throughlaterally-projecting ears I upon the heads, and provided with nuts attheir ends bearing against the ears, and the lower ends of the rods areextended downward, forming feet J, which serve to raise the lower headfrom the bottom of the well when the pump is placed upon the bottom ofthe same. A bent or curved pipe, K, passes with its upper end into anopening in the upper head of the cylinder, opening into the same, whileits lower end reaches to the same level as the bottom head, and forms anenlargement or valvelonger than'the thickness of the piston,

seat, L, in which a ball-valve, M, plays, which will allow water to bedrawn up through the pipe. of Missouri, have invented certain new and Nis the piston, which has a central circular perforation, O, of largerdiameter than the hollow piston-rod P, which opens with its lower enclinthe center of a circular disk, Q, which covers the central perforationof the piston, and is connected with a similar disk, R, by means'of anumber of rods, S, slightly which disk is uponthe under side of thepiston, the rods passing through the central perforation in the annularpiston, which plays upon the rods between the disks. A pin or bolt, '1,projects from the under side of the lower disk, and has its lower endcut off obliquely, so that when the piston is pushed down to the bottomof the cylinder the pin will push the ballvalve at the bottom of thesame to the side, allowing the water to run out of the cylinder, and anumber of bolts or pins, U, project upward from the bottom head of thecylinder, and serve toraise the annular piston, when it is pushed down,from bearing with its under side against the upper side of the lowerdisk, which closes the central aperture in the piston, and thus allowsthe water in the hollow pistonrod to escape into the lower end of thecylindcr, from whence it will run out through the ball-valve. A tube, V,of a larger diameter than the hollow pistoirrod, is secured at its lowerend to the stufiing-box in the upper head of the cylinder, and extendsupward the length of the hollow piston-rod and the length of the strokeof the same, when it is connected to the lower end of the pump-tube W,which maybe of any length, and which is provided at its upper end with asuitable outlet-spout. The upper 'end of the hollow piston-rod is open,and is attached to the .lower end of the solid piston-rod X, the upperend of which is attached to apump-lever or any other means forreciprocating it.

It will be seen that as the piston-rod is reciprocated the downstrokewill force the annular piston upward, closing access of the water in theupper portion of the cylinder into thehollow piston-rod, while it willallow the water in the lower portion of the cylinder to pass up throughthe piston-rod, and at the same time the downstroke of the piston willdraw the water through the bent pipe into the upper portion of thecylinder. When the piston now is raised, the force or resistance of thewater will force the piston down upon the lower disk, opening freepassage for the water in the upper portion of the cylinder into thepiston-rod, while at the same time the water is drawn into the lowerportion of the cylinder through the ball-valve in the bottom of thesame, the water thus passing up through the hollow piston-rodin acontinuous stream.

It will also be seen that when it is' freezing the water may all run outof the pump-tube, the hollow piston-rod, and the cylinderby pushing thepiston down to the bottom of the cylinder, when the pin upon the lowerdisk will open the ball-valve, and the pins in the bottom of thecylinder will raise the annular piston, allowing the water to pass outof the piston-rod aswell as out of the cylinder; and by raising thepiston-rod sufficiently to raise the upper disk upon its end above theannular piston, while the beveled pin still continues to hold the ballaside from its seat, the water in the pump-cylinder above the piston maypass through the central aperture in the same and out through the bottomvalve. 1

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States of upwardly-projecting pins in thebottom, a

hollow piston-rod having two disks at its lower end, secured at adistance apart, and opening between the two disks, and an annular pistonplaying between the disks, as and for the purpose shown and'set forth.

3. The combination, in apump, of the outlettube, the hollow piston-rodforming the outletpipe for the pump, having apertures at its upper end,and opening into and reciprocating in the outlet-tube, and the solidpiston-rod se-- cured to the upper end of the hollow pistonrod, andreciprocating in the outlet-tube, as and for the purpose shown and setforth,

In testimony that I claim the foregoing as my own I have hereuntoafiiXed my signature in presence of two witnesses.

BENJAMIN F. CALD ELL.

Witnesses:

E. L. BOREING, J. M. BOREING.

